Canon Camera Hackers Manual page 124

get_user_tv96 x
x = get_user_tv96()
set_user_tv96 x
set_user_tv96(x)
Retrieves and sets the value of the internal exposure time set by the user (96 units
per f-stop).
set_tv_rel x
set_tv_rel(x)
Modifies the current exposure time. A negative x makes the exposure time longer,
a positive x makes it shorter (3 units per f-stop).
set_user_tv_by_id_rel x
set_user_tv_by_id_rel(x)
Modifies the exposure time set by the user (3 units per f-stop).
set_tv96_direct x
set_tv96_direct(x)
Sets the exposure time value with 96 units per f-stop.
Index Tv96
–12 –384
–11 –352
–10 –320
–9 –288
–8 –256
–7 –224
–6 –192
–5 –160
–4 –128
–3 –96
–2 –64
–1 –32
0 0
1 32
2 64
uBasic
Lua
uBasic
Lua
uBasic
Lua
uBasic
Lua
uBasic
Lua
Speed Index
15" 18
13" 19
10" 20
8" 21
6" 22
5" 23
4" 24
3"2 25
2"5 26
2" 27
1"6 28
1"3 29
1" 30
0"8 31
0"6 32
Tv96 Speed
576 1/60
608 1/80
640 1/100
672 1/125
704 1/160
736 1/200
768 1/250
800 1/320
832 1/400
864 1/500
896 1/640
928 1/800
960 1/1000
992 1/1250
1024 1/1600
5.5 CHDK commands
Table 5-1
Exposu re index vs. exposure time
115